device.cpp

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#include "stdafx.h"

#include <windows.h>

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "devioctl.h"
#include <setupapi.h>
#include <basetyps.h>

#include "ioctl.h"
#include "GUID829.h"

char completeDeviceName[256] = "";  //generated from the GUID registered by the driver itself 


HANDLE
OpenOneDevice (
    IN       HDEVINFO                    HardwareDeviceInfo,
    IN       PSP_INTERFACE_DEVICE_DATA   DeviceInfoData,
	IN		 char *devName
    )
{
    PSP_INTERFACE_DEVICE_DETAIL_DATA     functionClassDeviceData = NULL;
    ULONG                                predictedLength = 0;
    ULONG                                requiredLength = 0;
	HANDLE								 hOut = INVALID_HANDLE_VALUE;

    // allocate a function class device data structure to receive the
    // goods about this particular device.
    SetupDiGetInterfaceDeviceDetail (
            HardwareDeviceInfo,
            DeviceInfoData,
            NULL, // probing so no output buffer yet
            0, // probing so output buffer length of zero
            &requiredLength,
            NULL); // not interested in the specific dev-node


    predictedLength = requiredLength;

    functionClassDeviceData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc (predictedLength);
    functionClassDeviceData->cbSize = sizeof (SP_INTERFACE_DEVICE_DETAIL_DATA);

    // Retrieve the information from Plug and Play.
    if (! SetupDiGetInterfaceDeviceDetail (
               HardwareDeviceInfo,
               DeviceInfoData,
               functionClassDeviceData,
               predictedLength,
               &requiredLength,
               NULL)) {
        return INVALID_HANDLE_VALUE;
    }

	strcpy( devName,functionClassDeviceData->DevicePath) ;

    hOut = CreateFile (
                  functionClassDeviceData->DevicePath,
                  GENERIC_READ | GENERIC_WRITE,
                  FILE_SHARE_READ | FILE_SHARE_WRITE,
                  NULL, // no SECURITY_ATTRIBUTES structure
                  OPEN_EXISTING, // No special create flags
                  0, // No special attributes
                  NULL); // No template file

    if (INVALID_HANDLE_VALUE == hOut) {
    }

	free(functionClassDeviceData);

	return hOut;
}


HANDLE
OpenUsbDevice( LPGUID  pGuid, char *outNameBuf)
{
   ULONG NumberDevices;
   HANDLE hOut = INVALID_HANDLE_VALUE;
   HDEVINFO                 hardwareDeviceInfo;
   SP_INTERFACE_DEVICE_DATA deviceInfoData;
   ULONG                    i;
   BOOLEAN                  done;

   NumberDevices = 0;

   //
   // Open a handle to the plug and play dev node.
   // SetupDiGetClassDevs() returns a device information set that contains info on all 
   // installed devices of a specified class.
   hardwareDeviceInfo = SetupDiGetClassDevs (
                           pGuid,
                           NULL, // Define no enumerator (global)
                           NULL, // Define no
                           (DIGCF_PRESENT | // Only Devices present
                            DIGCF_INTERFACEDEVICE)); // Function class devices.

   //
   // Take a wild guess at the number of devices we have;
   // Be prepared to realloc and retry if there are more than we guessed
   NumberDevices = 4;
   done = FALSE;
   deviceInfoData.cbSize = sizeof (SP_INTERFACE_DEVICE_DATA);

   i=0;
   while (!done) 
   {
      NumberDevices *= 2;


      for (; i < NumberDevices; i++)
	  {

         // SetupDiEnumDeviceInterfaces() returns information about device interfaces 
         // exposed by one or more devices. Each call returns information about one interface;
         // the routine can be called repeatedly to get information about several interfaces
         // exposed by one or more devices.
         if (SetupDiEnumDeviceInterfaces (hardwareDeviceInfo,
                                         0, // We don't care about specific PDOs
										 pGuid,
                                         i,
                                         &deviceInfoData)) 
		 {

            hOut = OpenOneDevice (hardwareDeviceInfo, &deviceInfoData, outNameBuf);
			if ( hOut != INVALID_HANDLE_VALUE )
			{
               done = TRUE;
               break;
			}
         } 
		 else 
		 {
            if (ERROR_NO_MORE_ITEMS == GetLastError())
			{
               done = TRUE;
               break;
            }
         }
      }
   }

   NumberDevices = i;

   // SetupDiDestroyDeviceInfoList() destroys a device information set 
   // and frees all associated memory.
   SetupDiDestroyDeviceInfoList (hardwareDeviceInfo);

   return hOut;
}

int init()
{
	HANDLE hDEV = OpenUsbDevice( (LPGUID)&GUID_CLASS_D12_BULK, completeDeviceName);
	if(hDEV==INVALID_HANDLE_VALUE)
		return -1;
	CloseHandle(hDEV);
	return 0;
	
}


BOOL
GetUsbDeviceFileName( LPGUID  pGuid, char *outNameBuf)
/*++
Routine Description:

    Given a ptr to a driver-registered GUID, give us a string with the device name
    that can be used in a CreateFile() call.
    Actually briefly opens and closes the device and sets outBuf if successfull;
    returns FALSE if not 

Arguments:

    pGuid:      ptr to GUID registered by the driver itself
    outNameBuf: the generated zero-terminated name for this device

Return Value:

    TRUE on success else FALSE

--*/
{
	HANDLE hDev = OpenUsbDevice( pGuid, outNameBuf );
	if ( hDev != INVALID_HANDLE_VALUE )
	{
		CloseHandle( hDev );
		return TRUE;
	}
	return FALSE;

}

HANDLE
open_dev()
/*++
Routine Description:

    Called by dumpUsbConfig() to open an instance of our device

Arguments:

    None

Return Value:

    Device handle on success else NULL

--*/
{

	HANDLE hDEV;
    hDEV = CreateFile (
		completeDeviceName,
		GENERIC_READ | GENERIC_WRITE,
		FILE_SHARE_READ | FILE_SHARE_WRITE,
		NULL, // no SECURITY_ATTRIBUTES structure
		OPEN_EXISTING, // No special create flags
		FILE_FLAG_OVERLAPPED, // No special attributes
		NULL); // No template file
	
	return hDEV;
}


HANDLE
open_file( char *filename)
/*++
Routine Description:

    Called by main() to open an instance of our device after obtaining its name

Arguments:

    None

Return Value:

    Device handle on success else NULL

--*/
{

	HANDLE h;
	char tmpfilename[256];
	strcpy(tmpfilename,completeDeviceName);
    strcat (tmpfilename,
			"\\");			

    strcat (tmpfilename,
			filename);					

	h = CreateFile(tmpfilename,
		GENERIC_WRITE | GENERIC_READ,
		FILE_SHARE_WRITE | FILE_SHARE_READ,
		NULL,
		OPEN_EXISTING,
//        FILE_FLAG_OVERLAPPED,
		0,
		NULL);

	return h;
}


HANDLE
open_file_os( char *filename)
/*++
Routine Description:

    Called by main() to open an instance of our device after obtaining its name

Arguments:

    None

Return Value:

    Device handle on success else NULL

--*/
{

	HANDLE h;

	char tmpfilename[256];
	strcpy(tmpfilename,completeDeviceName);
    strcat (tmpfilename,
		"\\");			
	
    strcat (tmpfilename,
		filename);					
	
	h = CreateFile(tmpfilename,
		GENERIC_WRITE | GENERIC_READ,
		FILE_SHARE_WRITE | FILE_SHARE_READ,
		NULL,
		OPEN_EXISTING,
        FILE_FLAG_OVERLAPPED,
		
		NULL);

	return h;
}